Method of forming joints and joint strips adapted to form joints



'March 14, 1939. c LORD ET AL 2,150,282

METHOD OF FORMING JOINTS AND JOINT STRIPS ADAPTED TO FORM JOINTS 1 Original Filed June 25. 1931 QTTORNEYS.

Patented Mar. 14, 1939 UNITED STATES DIETHOD OF FORMING JOINTS AND JOINT- STRIPS ADAPTED Hugh 0. v Thomas Lord Original TO FORM JOINTS Lord and Thomas Lord, Eric, re; s aid assignor to said Hugh 0. Lordpplication June 23, 1931, Serial No.

Divided and this application Novem'- her 3, 1933, Serial Nova 16,529

18 Claimsand central member.) Such' jointsare used for various purposes, as for instance, as mountings where it is desired to absorb vibration. The present invention is designed to form a joint having load supporting and load carrying means which can',be nore readily and economically manufactured and to provide a method whereby this may be carried out. With the present invention in its preferred form one ofthe means-preferably the outermeans is formed by utilizing an elongated plate preferably forming side strips which may be formed'to provide a base for the joint and, also in thepreferred form when an outer plate is used it"is provided with openings in which the supporting or load carrying means of the joint is arranged with rubkgersecured to the other means of the joint, preferably to the o faces of the plate along the periphery of the opening. In carrying out the invention also one, of the means as central members may be provided of cylindrical form and of some axial length, or they may be formed of a flat plate and the rubber secured te the centralmember forming the flat plate by bonding it preferably to the faces of the plateadjacent to the periphery.

\ The invention contemplates also the forming of a joint strip from which a plurality of joints may be severedand'this is facilitated with the joint having the preferred form of perforated plates,

but the invention is not limited in its broader aspects in this respect tothis specific joint.

Features and details of the invention will eppear from the specification and claims.

A preferred embodiment of the invention is 11-- lustrated in theaccompanying drawing as follows:-- I v Fig. 1 shows a central section through a finished joint having supportirfg' feet at its sides- .and utilizing a tube for its central member.

Fig. 2 shows a perspective view ofa mold indicating the joints in process of manufacture, themold being partly in section and showndwitlr' one part of the mold removed.

Fig. 3 shows a perspective view of a manner of v ing in the plate It. Arubber member l8 bridges processing the plates forming the joint.

' Fig. 4 a perspective view of one of the plates showing the manner of laying up the rubber thereon prior to molding. v

- 9 5. I Fig.5 a perspective view showing the use of the joint. s I

6 a plan view of a modified joint.

Fig. 7 a section on the line 1-1 in Fig. 6.

Fig. 8 a sectional view of a further modification. 5. The oint, as shown in Fig. 1, has a plate I with si e flanges 2'terminating in feet 3. .It-is provided with a central member 4 and a rubber imember 5,the rubber member extending at 6 along the central member 4 which is in the form 10 of a tube and extending over the edges of .an opening l-in the plate I forming rings 8' of rubber on opposite faces of the plate adjacent to the periphery of they opening. The rubber between the plate and the central member maybe made of .15

the thickness desired, but is ordinarily somewhat thinner. than the portions 8 so that the movenient ofthe joint is in this portion of the rubber bridging the space and where used as amounting as it ordinarily is the rubber sustains the load 20 through the shear of the rubber and thus facilitates the absorption ,ofvibration through. the action of the rubber. v y

In Fig. 5 a joint'of this character is shown as carrying a radio instrument la and-indicates'the 25 ordinary manner of use.. L e In Figs. 6 and '7 a modification of such a joint is shown. Here the outer member, or plate I0 is flat having perforations II at its corners by ,which it may be readily-secured. A central tube 30 I2 is connected by a rubber member l3 with the 'outer plate, the rubber extending at l4 along ,the tube l2 and extending over the faces of the plate l0 adjacent to the periphery of the opening. Shoulders or rings iii of the rubber along the 35 surfaces of the plate are thickened and have a relation to the length of the tube 12 so as to form a limiting stop. This relation is so adjusted that I when the weight'is attached and the natural sag of he a free vibration range is established without resistance bythe shoulder I5, but any out of the ormal shock carries the load on to the shoulders,

5 and the movement is thus arrested. The flat plat' forms a proper backing for taking this 45 shock. i

In Fig. 8a modified joint is shown in which there is an outer plate l6 having a joint opening arranged therein. A central member I! is in e the form of a plate, the outer periphery of, the 50 plate l1 being within the periphery of the openthe space between the plates l1 and I6 and has an extension IS on the outer periphery bonded to the faces of the plate l6 adjacent to the open- 55' rubber under the weight has ,taken place 40 ing. The rubber likewise has extensions 20 on its inner periphery which extend over and are preferably bonded to the faces of the plate I1. The plate I6 is shown as a fiat plate being similar in contour to the plate i2 shown in Fig. 6. It will be understood that the plate IE, or the plate I: with the form of rubber mounting may have the flanges 2 and feet 3, as indicated in Fig. 1, if this is desired.

In both the structures of Figs. 6 and 8, as well as the structures shown in Fig; 1, they are ordinarily used with the rubber in shear, at least in In all of these joints it may be preferable to secure the. rubber to the joint members-by vulcanization so that the rubber of the joint member is put under initial tension through the shrinkage of the rubber.

The structure is of particular advantage by reason of its cheapness, by the fact that the surface of the bonding may be extended as much as may be desirable and it lends itself readily to expansion into large sizes. The wall of rubber 8, Fig. 1, l5, Fig. 7, and I8, Fig. 8, which extends upwardly, or downwardly from the overlapped and bonded surface of the plate is in direct (tension or compression) thrust relation with the overlapped portion of the plate and the rubber within the plate, as the rubber 5 in Fig. 1, l3 in Fig. 7, and the rubber extending radially between the plates in Fig. 8, is in shear. The surrounding wall l5, or [8, is subjected when the central member is under load to a compression stress above the plate and a direct tension stress below the plate. Inasmuchas the compression resistance and the tension-resistance of the rubber is very much greater than the resistance of the-rubber in shear the yielding axially of this surrounding wall is very litttle compared to the shear movement of the rubber projecting from the plate into the space in and above and below the opening in the plate and this remains true as the depth of the wall in a direction perpendicular to the plate is increased. .This surrounding wall, therefore,-supports the rubber which yields in shear in much the same manner as a perpendicularly extending metallic wall surrounding the rubber in shear and bonded thereto. The thickness of the wall and the surface of the bonding on the plate may be extended radially as much as desirable to give the proper support for the more active rubber inshear and this wall may also be extended perpendicularly to the face of the plate so as to give a greater depth of rubber subjected to shear. This utilization of a rubber wall supporting the more. active rubber in shear may be extended, as in Fig. 8, to the central member and the same functional action takes place with relation to such wall as with the outer wall. In either case, the rubber projects from the plate, or wall, into the shear space and in either case the rubber is supported by the plate and the rubber wall projecting perpendicularly from the plate. While We have shown the inner and outer members in alinement radially, it will be understood that while this is preferable, the central member may be simply within the projected area of the opening.

In fabricating these joints theplate 28 forming the outer member of the joint is fabricated in lengths carrying-a plurality of openings. This permits of processing the metal for. a plurality of joints in a single operation.

In Fig. 3 bufiing wheels 29 are shown operating shear with relation to the vibration thrusts upon it 2,150,282 I simultaneously on the top and bottom of a plate,

such as is used in the joint shown in Fig. 1. After the plate is properly. processed the rubber 30 having a proper bonding face is'laid on the top and bottom surfaces of the plate bridging the openings 1 in the plates- Perforations 36 are formed in these strips of rubber and the tube, as the'tube 6, inserted in the center of the opening. This plate with the tubes and rubber in this form is placed in the mold, the mold having the cavities 31 receiving the rubber with cut-off, or gate surfaces 32 in the locations at which the plate is to be severed to form the individual joints. The mold has an annular portion 33 shaping it for the rubber-to give the rubber'the desired strength. and has a central socket 334 bottoming and locating the central tube. The plate is placed in this mold with the rubber placed as in Fig. 4 and a similar upper mold operates on a plurality of joints on the plate. Ordinarily there are not only a plurality of joint on each plate, but surfaces to receive a plurality of plates, as shown in Fig. ,2. The plates are'preferably provided with perforations 35 in the side flanges so that after the molding operation the main plate and feet may be severed'by a direct shearing operation. In this way joint strips from which individual joints may be severed may be very readily f abrlcated and in a manner cheaper than is practical as to individual joints and while we have described this feature of the invention as forming a particular type of joint we do not wish to be limited in the broader phases of the invention to such particular type in this respect. It also permits of the ready fabrication of such strips with the supporting feet and side walls included and from which the individual joints may be severed. the resilient portion of the mounting being carried between these side strips and supporting a second member'of the mounting as clearly shown in Figs. 1 and 4.

In molding. the flat center structure, as shown in Fig. 8, the same system is used except that the central plate is centered through the mold by any registering device in the manner similar to the centering of the central tube. I

While we have described and shown individual mountings we do not in this application claim the individual'mountings as such individual mountings form the subject matter of application No.

546,214 (Patent No. 1,996,210) of which division.

What we claim as new is:--

1. The method of forming joints which consists in forming a plurality of openings in a metal plate, providing said openings with central members, providing rubber in bonding relation to the flat plate and said central members with the this is a members placed within the projected area of the openings and in the rubber, bonding the rubber in place by vulcanization of the body of rubber to a resilient consistency, securing the same to the central member and to the face of the plate, and severing the plate to form individual joints.

2. The method of forming joints which consists in forming a plurality of perforations in a metal plate, providing rubber in bonding relation on both faces of the plate covering said perforations, providing central-members in the rubber within theprojected areas of the said perforations, vulcanizing the rubber in place to a resilient consistency, bonding the same to the central member and to the faces of the plate adjacent tothe perforations, and severing the plate to form. individual joints.

' means spaced apart,

in uniting in a unit during silient rubber between supporting ing members spaced apart, one the formof an elongated strip,

vulcanization reand load carryof which is in the rubber extending in the unit through free space between the members and with the unit so formed adapted to be severed to form'individual joints, and severing the unit crosswise of the elongated strip to forma plurality of joints. l

4. The method of making joints which consists in uniting in a unit during vulcanization resilient rubber between supporting and load carrying means spaced apart, one of the means including elongated side strips, the rubber extending-in the. unit through free spacebetween' the means, and. with the unit so "formed adapted to be severed to form individual joints and severing the unit crosswise of the elongated strips to form a plurality of joints.

5. The method of making joints which consists in uniting-in a .unit during vulcanization resilient rubber between supporting and load carrying including an elongated metal side strip, the rubber being united with the metal strip by bonding through vulcanization, the rubberextending in the unit through apart, one of which co and rubber united with the members during vulto form, when severed, a

with the means extending free space between the means, and unit so formed adapted to be severed to form individual joints, and wise of-the elongated strip to form a plurality of joints.

6. The method. b making joints which consists in uniting in a unit" during vulcanization resilient rubber between supporting and load carrying means spacedapart, one of the means including elongated'metal side strips, the rubber being united with said means by bonding through vulcanization, the rubber extending in the unit through: free space between the 'means, with the unit adapted to. be severed to form individual joints, and severing the unit crosswise of elongatedstrip to form a plurality of joints.

arr'ying members spaced supporting and load prises an elongated strip,

7. A join strip forwffrmingjoints. comprising canization extending through free space between the members, the joint. strip being adapted to form. a plurality of joints when severed. p

8. A joint strip for forming jointscomprising supporting and load apart, one of which strips and rubber united during vulcanization with the means extending through free space between the means, the joint strip being adapted plurality. of joints.

9. A joint strip for forming supporting and load carrying means spaced apart, one of which comprises elongated side strips and rubber united during vulcanization through free space between't'he means, the joint strip being adapt to form, when severed, a plurality of joints, the rubber being disposed to carry the load inshear.

10. A joint strip for forming joints comprising supporting and load carrying means spaced apart, one of which comprises elongated side strips, and rubber united during vulcanization with said means and extending through free space between the means and disposed to carry a load in shear, the side the rest of the joint forming a base for the joint.

11. A joint strip for forming jointscomprising supporting and load carrying means spaced the side strips extending with said means and extending between the means and disposed to carry a load with the severing the unit crossv cushion the joint,

the

- supporting apart, one of which comprisesan elongated strip carrying means spaced comprises elongated side joints .comprising 1 strips extending below a 4 3 apart, comprising elongatedmetal side strips, and rubber united uring vulcanization with said means and extending through free space between the means and disposedto carrya' load .in shear,

joint forming a base for the joint.

12. A joint strip for forming joints comprising supporting and load carrying means spaced apart, one of which comprises elongated metal side strips, and rubber united during vulcanization through, free space in shear, the side strips extending below the rest of the joint forming a base for the joint, the

joint strip adapted, when severed, to--form a plurality of joints.

13. The method of forming joints which consistsin forming a flat plate with'a plurality 'of perforations, arranging rubber on said plate over said perforations and overlapping the plate at the. edges of the perforations with the rubber below therest of the extending edgewise into the perforations and free to resiliently respond and cushion the joint, vulcanizing the rubber to a resilient consistency, bonding, the same by .vulcanization to at least one face of the plate adjacent to the perforations, and severing the plate to form individual joints.

'14. The methodof'forming joints which consists in providing a flat plate with perforations, placing rubber on both sides of the plate and over said perforations'and voverlapping the plate at-the edge of the perforations with the rubber extending .edgewise into the perforations and free to're resilient consistency, canization at least. one face of the plate adjae a plurality of liently respond and vulcanizing the rubber to a bonding the same by vulcent to the perforations, and severing the plate I to form individual joints.

15. A joint strip for forming joints comprising supporting and load carrying means spacedapart, one of which comprises'an elongated strip with perforations at intervals along the strip and the other means comprising members in the projected areas'of the perforations; and rubber united during vulcanization with said means extending through free space between the means and disposed to carry a, load in shear.

16.. A joint strip for forming oints comprising and load carrying means spaced with perforations at intervals along the strip, and'the other means comprising members in the projected areas, of the perforations; and rubber united during vulcamzation with said means extending through free space between the means and disposed to carry a load in shear, the elon-,

to form a plurality of .joints when severed at a point of separation of the rubber. v 18. The method of making jointswhich consists in uniting in a unit during vulcanization,

resilient rubber between supporting and load' carrying members spaced apart, one of which the rubber 75 I is in the form of an'elongated strip,

ing supporting and load carrying members spaced embers and with the rubber sulg extending in the unit through free space between separation of the rubberto form individual joints, the members, and being initially in the form of and severing the unit crosswise of the elongated a strip extending in binding relation along the strip at a point of separation of the rubber to elongated strip member, and separating transform a. plurality of joints.

versely in the vulcanizing operation intermedi- HUGH C. LORD. ate the ends.,0f the strip whereby the unit so THOMAS LORD. formed is adapted to be severed at a point of 

